The Authorised History of GCHQ, Britain's Secret Cyber-Intelligence Agency
You know about MI5. You know about MI6. Now uncover the mystery behind Britain's most secretive intelligence agency, in the first ever authorised history of GCHQ.
Based on unprecedented access to classified archives, Behind the Enigma is the first book to authoritatively tell the entire history of this most unique and enigmatic of organisations - and peer into its future at the heart of the nation's security.